Display screen portion with a graphical user interface



The FIGURE illustrates a front view of a display screen portion with a graphical user interface depicting an image displayed thereof.

The evenly spaced broken lines illustrate the display screen portion and form no part of the claimed design. The dot-dot-dash broken lines represent the boundaries of the claimed design and form no part thereof. 

CLAIM The ornamental design for a display screen portion with a graphical user interface, as shown and described. 